to compute engine power/torque you could already use the speed input (when there is no tire slip), as "delta(speed/time)" should be identical to the acceleration reading (hopefully)
G reading is interesting on the 1/4mile, you can clearly see how long shifting is realy interrupting the acceleration, so the true shift-time can be calculated.
(and with the g/rpm/throttle/boost/clutch/speed a real analysis of the shift timing can be done
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#md timestamp gps time gps coordinate gps speed gps directon GPSHorizontalAccuracy GPSVerticalAccuracy 316488 Fr. Sep 27 18:33:39 2013 49° 12' 6.6" N, 7° 1' 21.9" E, 192.5m 62.928 132.95 142.18 181
gps speed 62,9
md speed 64 km/h